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So goes Google, so goes the Google Doodle. Sometimes the Doodles warm the heart, sometimes they remind you of great things, and sometimes they celebrate odd-numbered birthdays of people that contributed something important to society. Today’s Doodle represents the latter, and is celebrating the 161st birthday of the inventor of the Petri dish, Julius Richard Petri.

Rather than some stoic science scene, though, Google went down a more interesting route. Each letter of Google’s iconic logo is represented by a Petri dish that, when animated, will receive treatment from a swab and grow some bacteria. Hovering the mouse over each Petri dish will invoke a little animation that reveals where the bacteria in the dish came from. Starting from the left, the bacteria that forms the first G is a dirty sock, the first O is a doorknob, the second O is a keyboard, the second G is a dog (seemingly focused on the mouth), the L is from the soil surrounding a plant, and the E is from a household sponge. You can now thank Julius Richard Petri for reminding you that everything is disgusting and you probably shouldn’t touch anything.

The Petri dish was invented in the late 1870s as Petri worked as an assistant to Robert Koch — who happens to be the father of modern biology — soon after he received his medical degree in 1876.

It always seems a little weird that Google Doodles tend to celebrate anniversaries that are oddly numbered, and a 161st birthday isn’t particularly a milestone number for someone that isn’t actually alive. If it gets us fancy Google Doodles to occupy ourselves with for a few minutes, though, who’s counting?